One of its engravings is believed to be among the first representations of medical and surgical instruments.

The largest known Ancient Egyptian obelisk.

In Egypt's expanding metro area, many of the neighbors are dead.

Egyptian treasure trove of fossils documenting the whale's transition from land mammal to sea creature.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

An abandoned outdoor movie theater in the Sinai desert.

An endless sea of white conical domes.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

One of the most well-preserved temples of ancient Egypt.

An alien landscape of chalk-rock in the Egyptian desert.

An ancient city exhumed from the depths of the ocean.

A resort destroyed by a mysterious bombing offers visitors only its remains and the riddle behind it's demise.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Crushed coral and crystals give the sand its signature coloration.

Windblown rock formations in an ancient Roman quarry.

The royal seat of Henri Christophe, a formerly enslaved man who became Haiti's only king.

An acoustic anomaly with a mysterious cause.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

A memorial commemorating the only Scottish police investigation into an extraterrestrial incident.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

A library where thousands of books explain how to avoid another Great Recession.

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

Built by George III to observe the transit of Venus, this Georgian gem is a unique survivor in the Arcadian landscape of Richmond upon Thames.

The Great Fire of London and the regulation of one-way streets both started in this alley.