The last bastion of Roman presence north of the Alps looms over a German town.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Tiny castle in the middle of the Rhine made you pay to pass.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

World's largest barrel containing an inn.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Vibrant street art created with mixed media.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This one-time health resort was used by aristocrats around the world.

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

Sofia's legislative center is continuously reinventing itself.

A vast Communist-era exhibition space in the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

This historic black and white monastery is one of Bulgaria's architectural jewels.

An abandoned saucer-shaped monument in the Bulgarian mountains.