Taj Mahal

The Mogul emperor Shah Jahan ordered it after the death (1629) of his
wife, Mumtaz Mahal. Designed by a Turkish architect, it was
built (1630-48) in a walled garden with an oblong
reflecting pool. The white marble exterior is inlaid
with semiprecious stones, floral designs, and
arabesques. The dome, 80 ft (24.4 m) high and
50 ft (15.2 m) in diameter inside, forms a bulb
outside, tapering to a spire topped by a
crescent. The octagonal tomb chamber is
lit by light passing through
intricately carved screens.

I got my info from: The History Channel