According to Wiki Answers, the Lotus Temple in Dehli is the most visited building in the world! The Temple is a Bahá’í House of Worship and receives it better known name due to its flowerlike shape.
There definitely were a lot of visitors to the temple, and only a few were foreigners. After seeing photos I did expect it to be a much larger building, but otherwise it exceeded all my expectations.
The building was completed in 1986 and was designed by an Iranian architect, Fariborz Sahba. Bahá’í Houses of Worship are open to everyone, regardless of religion. One essential architectural character of a House of Worship is a nine-sided circular shape, the Bahá’í scripture also states that no pictures, statues or images be displayed within.
The building does have obvious similarities to the Sydney Opera House but despite its complicated structure, offers a simple place of worship inside and walkways around the lower nine pools and the upper concourse.
Unfortunately photos were not allowed inside, but it was one of the most beautiful buildings I have ever been in. The engineering was incredible, with concrete columns seeming to form a spider web form with panels of marble tiles appearing to float off the walls.
The building photographed really well but It is well worth searching for an aerial view of the temple as well as photos of the inner worship area.