It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

This amusement park brings a little slice of England to the heart of Kyushu.

This hillside village by the sea has been revitalized by street art.

A bizarre collection of gifts to North Korean dictator Kim Jong Il from the despots of the world.

An LED art installation composed of 600 poles wrapped in kimono fabric.

Devoted Buddhists can earn enlightenment in the next life by crawling through this symbolic nostril.

Japanese national treasure originally built in 593 CE.

Twelve hundred stone carvings guard this off-the-beaten-path Buddhist temple.

A massive, heart-shaped, wind-carved crater in the middle of the Israeli desert.

The fairy tale castle of the "fairy-tale king."

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

America's only nuclear missile silo open to the public.

A spiritual vortex among the red rocks in Sedona.

A Wild West jailhouse that slid down the mountainside.

A geological mystery on Camelback Mountain.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

An abandoned masterpiece of Soviet Brutalist architecture.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.