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

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

These temples are among the oldest free-standing stone buildings in the world.

The bell that once tolled atop a lost Edinburgh gate now hangs for all to see.

Enormous sandstone towers loom within a Czech forest.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

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

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

The pockmarks across the building's facade are remnants of the Blitz.

The 20th-century archaeologist was interred among the ruins of an ancient Roman city.

This ancient Roman arch misled treasure hunters for centuries.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

A peculiar samurai statue overlooks the center of Brno.

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

This colorful statue welcomes visitors to a Barcelona park.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

This beautiful spit of land was once the summer playground of the king of Spain.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

The only pub in the world surrounded by an ancient stone circle.

This two-legged horse statue celebrates a beloved cartoonist and his quirky characters.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.