The Sultan Amir Ahmad bath of Kashan
The Sultan Amir Ahmed's bath in Kashan is a 16th-century public bath built in the Safavid rule over Iran, part of Turkey and Georgia (from the 16th to the 18th centuries). This luxurious and charming structure, which is featured with vaulted ceilings, mosaics, and exquisite paintings, is one of the most beautiful and most protected historic baths in Iran to date.
The Sultan Amir Ahmad Bath of Kashan, whose name was derived Imamzadeh Sultan Amir Ahmed, was registered in 1956 as a national historical monument at the Iranian Cultural Heritage Organization. The tomb of this Imam Zadeh is close to the bath, but there is little information about this holy man. 
The Sultan Amir Ahmad Bath of Kashan is surrounded by a large octagonal hall with an octagonal pool in the center of it, surrounded by eight columns that separate it from the courtyard. Of course, this is not the main part of the bath; the salon for dressing or Sarbineh was the place where the bathers lied and engaged in discussions and social works.
In ancient times, public baths played an important role in the lives of Iranian people, and this is still the case. Public baths were not meant to be made for the purpose of washing, but rather as a place for gathering, meeting, rumors and even worship.The main area for washing or bathing (Garmkhaneh; warm house) of the Sultan Amir Ahmed bath includes several private baths. The Garmkhaneh is connected to the Sarbineh by a corridor with several twists and turns to reduce the heat and moisture that exchanges between the two environments. 
The interior environment of the Sultan Amir Ahmad Bath and especially the Sarbineh is featured with Firoozei (Turquoise) and golden tiles, plastering, brickwork as well as artistic paintings. The roof of the bath of Sultan Ahmad is made of several domes, on which convex glass is attached to provide the bathroom light when the doors are closed.
The phenomenon of public baths also existed before the entrance of Islam into Iran. After most Iranian people accepted Islam as their religion, bathing became an integral part of life by washing the body with one of the essential requirements of religious life, and so on. There were thousands of public baths throughout Iran. Their popularity has declined in recent times, as most modern homes now have a shower and a bath. Several remaining public baths in Iran attract only workers and tourists. If you are visiting Kashan, be sure to visit this building.

Restoration background
In 1996, this bath was bought by the municipality of Kashan under the auspices of the Trustees of the Restoration and of Kashan Historical Buildings with the effort of Minister of Industries and Mines, Eng. Mahlouji. A project entitled Restoration of Sultan Amir Ahmad bath under the supervision of Eng. Mehdi Hushmandinejad and the collaboration of Professor Seyyed Ali Akbar Helli and the late Doctor Afsari was taken to save the bath from destruction. This bath has been changed for some time as a traditional dining room and cafe, but today it is located as a museum covered by the welfare and recreation organization of the municipality of Kashan.

The architecture of the bath
The bath is considered to be the most complex of buildings because of the principles that need to be built. This space was built at a lower level from the ground and in the soil in order to maintain its internal heat and save energy. The Sultan Amir Ahmad Bath has very eye-catching decorations and is considered as a unique bath. The lime and stucco of this building catch any tourist's gaze. Ahakbori (carving on lime) is the art of embossing patterns on a surface of lime, is one of the most beautiful decorations of Iranian buildings. There are 17 visible restoration layers in this building, which have its history.
Turquoise and golden tiles, seven layers of plaster and special architecture, have made this bath one of the most prominent baths in Iran.
Other features of this bath include the use of vaulted ceilings, eye-catching mosaics and wall paintings that have created a special effect. Access path and visit information 
Address:
Sultan Amir Ahmad Alley, Alavi Street, Kashan, Isfahan. 
Visit time:
The first six months of the year from 08:00 to 20:30
The second six months from 08:30 to 18:30
Sights around 
Historical house of Boroujerdi | 60 meters walk
Historical house of Abbasid | 150 m walk
Historical house of Tabatabaei | 220 m walk
School and Mosque of Aghabozorg | 750 m walk
Also, a number of hotels in Kashan were built near the building, which are not far from these tourist attractions in Kashan, and you can easily access these buildings from Kashan hotels and one of the attractions of these hotels compared to the hotels in Iran is their traditional architecture.

Tourists’ comments
Here we review some of the comments on the Trip Advisor website to see the points of view of foreign tourists who are visiting Kashan in their trip to Iran. 
Jounia from Thailand | January 6, 2018
An interesting attraction 
Try to take advantage of the tips. There was one person who explained the place well and did not need to pay any money at all. I love the roof of this place... it's very interesting.
A tourist from the Netherlands | Dec 1, 2017
Beautiful bath with a spectacular view on the roof
Massive maze that is full of colorful tiles. It has a very beautiful atmosphere and it is a little difficult to imagine that some people were bathing in the past. The roof has a nice view of Kashan. You should not miss visiting this tourist attraction of Kashan and one of the things you can do in Kashan is visiting this bath.
Australian tourist | Nov 30, 2017
Try to see the roof
On the roof, you can see beautiful domes. Tiles are available in different colors and sizes.
A tourist from the Czech Republic | Nov 19, 2017 
Old bath in downtown
One of the things you can do in Kashan is to walk on the roof of this bath and enjoy the beautiful view of the city and beautiful domes. The interior of this bath is covered with beautiful tiles. 
As we read in the comments, if you use Kashan tours, you can visit this historic site. Also, without using Kashan tours, try to find a guide to help you.