One of the most popular attractions in Greece, the Parthenon was built around 438 B.C. Although it served as a temple at certain points in history, it was originally built as a fortress and was also converted into a Christian church at some point, too. The construction of this immense building, most commonly known as the Temple of Athena, is extremely impressive when you consider the fact that all the stones used to build it were carried and laid in place by hand. The architecture of the Parthenon is impressive, as well. In building several tapered columns, the entire temple looks straighter than it actually is, a clever illusion used by the Parthenon's designers that still fools the eyes of many today.
Borobudur - Indonesia
This 9th century Buddhist temple is the largest in the world. A UNESCO World Heritage Site, this remarkable landmark contains over 500 Buddha statues, and some very ornate and striking designs. Completed around the year 825 A.D., Borobudur is still a popular pilgrimage site. The immense temple was actually lost under volcanic ash, until it was rediscovered and excavated in the early 1800s. How it disappeared still remains a mystery.