A small house sits between two huge rocks, with its back to the sea.

The original shop where the iconic Belgian praline was invented.

At a museum dedicated to the millenia-old rites and art of Buddhism, the Buddha's reputed tooth is held as an object of worship.

The supreme shrine of the state.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Reminiscent of a termite mound, this imposing structure is likely an ancient funerary monument.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This impressive chasm is one of the longest natural underground cavities in the world.

This medieval synagogue survived the Inquisition as a hospital and church.

A 16th-century Andalusian palace.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

This castle has links to Portugal’s founding and struggles for independence.

A hidden three-foot-wide house separates these two regal churches.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.