The largest brick bridge in the world.

Two monstrous faces loom over a village in Czechia.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

Hungarian self-built castle.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

This beautiful 14th-century castle perched on a promontory overlooks the Bay of Trieste.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

This medieval castle was reconstructed by Carlo Scarpa.

Since ancient times these picturesque springs have been providing bathers with healing waters.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

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

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

Historic medieval fortified city in southwest France.

The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

An archaeological treasure trove towers over the valley of Chiavenna.

Browse through a century of this principality's first popular export.

In one of the world's smallest countries, a royal's personal winery is open to the public.

A monument to peace, built by one man over the course of 25 years.