Luxor Temple

The Luxor Temple is one of the most important temples from Ancient Egypt. The temple is about 794 ft deep and thus the biggest temple in Egypt. The temple was constructed approximately 1400 BC by Amenhotep III on the remains of a previous temple built by Hatshepsut. A common technique used when building Egyptian structures was illusionism (Chefren used that technique when building his pyramid). At the Luxor temple it was used as well: the originally two obelisks flanking the entrance were not the same height, but they created the illusion that they were.

The massiv First Pylon. A pylon (two walls with an entrance in between) is hollow most of the time.

The second obelisk (the pedestal is still showing) was presented to France as a gift in 1833. It took 3 years to get relocated to the Place de la Concorde in Paris.

The second obelisk in Paris.

When restoring part of the historic mosque after a fire in 2007, experts uncovered parts of a temple dating to the reign of pharaoh Ramsesses II inside the mosque.

 Why this discovery did touch a nerve among religious leaders can be read in the news article of National Geographic.
 

The islamic Abu El-Haggag Mosque was erected as a shrine to Muslim saint Abul Haggag in the 13th century A.D. on the site of an earlier Christian church, which was itself built on top of the ancient temple of Luxor. The entrance is 39 ft off the ground.