Follow the original medieval paths that wind through this intriguing section of the city.

The little-known second castle that William the Conqueror built in York.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Cycle the solar system—from the sun to Pluto—right here on earth.

130 replicas of world wonders squeezed into just 118 acres of space.

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

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

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

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A whimsical bridge adorned with decorative dragons.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

Where the lovelorn find a home for their sentimental keepsakes.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A bloody history is captured in this former prison turned museum.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The sacred shrine of the Yazidis.