The ruined doorway is a portal to the building's turbulent and torturous past.

What once sat in the world’s spotlight is today a largely disused ghost complex.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

A sharp sculpture made of thousands of pieces of jagged glass.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

An ancient octagonal weather station named for the eight Greek gods of wind.

An autonomous republic of Orthodox monks.

A two thousand year old brothel uncovered in Northern Greece.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

The best place to send your postcards home from Antarctica.

One of the world's southernmost bars.

Naked scientists race around the pole in the frigid cold to try to join Antarctica's exclusive 300 Club.

Nimrod Polar Expedition base, and home to hundred-year-old frozen whisky.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

A wooden hut from the Heroic Age of Antarctic Exploration.

Giant money stones of Yap.

The underground hideout of a Japanese soldier for whom World War II ended in 1972.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.