This 13th century Gothic brick castle is the largest in the world by surface area.

Boats must transform into railroad cars to navigate this Polish canal.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

The two abandoned overpasses are among the largest bridges in Poland.

An engineering marvel at the time of its construction, this cross-border waterway sought to connect the Black Sea to the Baltic.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A muddy alien landscape that is home to rare species of exotic plants.

A statue dedicated to the founders of communism.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Elaborate mansions built by Roma residents in Soroca to show their success after centuries of discrimination.

A unique museum dedicated to the history of household appliances from across the globe.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

One of the best-preserved wooden manor houses in Latvia, decorated with painted interior walls.

This wooden recreation of a 9th century lake village looks as though it was built yesterday (which it relatively was).

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

A huge Soviet-era robotics factory in the outskirts of Prypiat, now long-abandoned.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chornobyl disaster.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

The dining hall that nourishes workers in Chornobyl's Exclusion Zone is also open to visitors.