1. Tan Ky Old House, located in Hoi An, Vietnam, is a famous and well-preserved architectural gem. It was built over 200 years ago by a Vietnamese merchant and its name translates to \"Progress Shop.\" The house has been passed down through seven generations of the same family.

The architecture of Tan Ky Old House combines elements of Chinese, Japanese, and Vietnamese styles. The structure is made up of a front house and a back house, creating an open courtyard in the middle. The front house is where the merchant conducted his business, while the back house was used for living quarters and storage.

One interesting fact about Tan Ky Old House is that it is designed to withstand flooding. The house has a wooden frame that is raised higher than the surrounding ground level. This helps protect it from the rising water during the monsoon season.

Another fascinating feature of the house is its interior design. Each room is adorned with beautiful wooden carvings and antique furniture, showcasing the craftsmanship of the past.

2. Tan Ky Old House is open to visitors daily from 8:30 AM to 5:30 PM. Unfortunately, there is no available phone number provided for the house.

3. The entrance fee for Tan Ky Old House is 20,000 VND (approximately 1 USD) per person. It is advisable to arrive by taxi or bicycle, as the old town area of Hoi An is pedestrian-friendly and parking space for cars can be limited.