This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

Another entry into the world of Edinburgh's pop-up artworks.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

Its collection includes a broad array of social, geographic, graphic design, and political history.

This Roman relic was discovered in Scotland by a mudlarking ferryman.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

The final resting place of soldiers' loyal canine companions.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

One man spent 10 years building a spectacular section of road because no one else would.

This stone throne invites adventurers to observe breathtaking views of the Peak District.

This single-track road rewards brave drivers with stunning Scottish scenery.

The commemorative stone column conceals a secret laboratory.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.