Rising from the sea like a stone monster.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

The center of the only hemisphere that awards visitors with a commemorative coin.

The castle still holds traces of the abandoned Roman fort it was built atop.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

Micro-nation based around a nine-story high illegally built tower.

Home to the world's oldest functioning orrery.

Two World War II aircraft lie within the jungle around this abandoned runway.

The world's largest drain sits below the city of Kasukabe, Japan.

Yugoslavia's biggest underground airport lies in ruins.

The world's second-largest sundial, made entirely out of stone.

One of the oldest living oak trees in the Southeast.

A striking 500-year-old mansion provides an unexpectedly sublime home for live deer and a menagerie of exotic stuffed animals.

400-year-old garden, restored to beauty.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A chapel on a volcanic core, marking the end of a successful journey.

Every Tuesday, students let off steam by screaming into the night air.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

The tallest stationary dunes on Earth also happen to sing.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.

A small village in India bears witness to the end of birds' lives every September.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.