The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

A staircase made of gravestones leads up to this church built into a giant rock.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

These caves secretly held national treasures during World War II.

Gladiators once walked this ancient, subterranean passage.

The site where hundreds of Greeks were tortured by the Nazi secret police is now a cosmetics store.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This famous archeological mystery may be an ancient example of movable type.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

Legend says this sacred tree was a gift from goddess Athena.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

Eat a meal surrounded by bomb fragments.

In the world's most bombed country relative to its size, this incredible organization helps pick up the pieces.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

A modern temple with an ancient philosophy.

Derelict airplane bodies serve as both home and income for three Thai families.

The pillars inside this small, ornate shrine hold Bangkok's horoscope within them.

A collection of venomous snakes and reptiles for the whole family to enjoy.

This Khmer temple is named after a young woman who sacrificed herself to protect the city from a disastrous deluge.

This mysterious tower is said to enshrine a dormant seven-headed serpent that once protected Vientiane from destruction.