Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

Climb to the top of the world's largest seated bronze Buddha.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

This artificial archipelago was supposed to resemble a map of the world.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The modern birthplace of Irish freedom.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The most loyal of little dogs, or a Victorian era publicity stunt?

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

The old tradition of drying laundry on poles in the public green is still guaranteed by Glasgow city law.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

Belfast's namesake river still winds below the city center, hidden from sight.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Spend your honeymoon where the Devil had his wedding.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.