A free public golf course hides in plain sight in the heart of Scotland’s capital.

A serene public space nestled within the remains of Glasgow’s Victorian maternity hospital

Glasgow's memorial to the International Brigade volunteers from Great Britain who fought and died in the Spanish Civil War.

The best-preserved ancient theater in the world.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The abandoned transportation hub hides within the Glasgow attraction it once served.

Alexander Hamilton’s creation caused quite a bit of controversy.

It houses a menagerie of wondrous taxidermy specimens from around the world, including the remains of a famous gorilla.

A mysterious ruin shrouded in more folklore than fact.

Learn local history while picking up groceries at this museum tucked inside a supermarket.

A 16th-century castle unexpectedly nestled within a post-war housing development.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

This slice of 1960s Danish modernism does not conform to the Oxford college stereotypes.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

This modern, multimedia museum takes visitors on an evolutionary journey back in time.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

The ornate structure is part of a building boasting more marble than the Vatican.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

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

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

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

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