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

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

"The most colorful grottoes of the world.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

The forbidden island of the Tuscan Archipelago may still contain buried treasure.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Jesus' footprints and the first catacombs in the world.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Ancient Greek oracle of the dead.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Venice's "Island of the Mad."

A true treehouse near Hawai'i Volcanoes National Park.