The private train station King Leopold II built for the Belgian royal family now lies abandoned.

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

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.

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

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

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

The modern birthplace of Irish freedom.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

This center tells the story of one of the most famous battles in Irish history.

This gnarled old tree supposedly sprouted from seeds kept in the pocket of a 16th-century Spanish sailor.

A museum marks and documents the site of the Titanic's launch.

These engineering masterpieces are a dominant feature of the Belfast skyline.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This massive monument has been telling the time for 150 years—at a slight angle.

It was once nicknamed "the most bombed hotel in Europe."

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This abandoned five-star hotel is now a five-star urban exploration destination.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.