Where Kevin Eastman and Peter Laird created their "heroes in a half shell" and founded Mirage Studios.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

An intentionally grounded cargo ship remains half-buried in the sand.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

This stretch of highway is said to be haunted by ghosts of settlers whose graves were paved over.

A monument to one of the few Olympic flames ever to be lit outside of the host city.

A statue honoring 44 continuous years of greeting passing ships.

"X" marks the spot of an echo chamber in the middle of a plaza.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

This sculpture may be the only known depiction of a man who helped finance the American Revolution and inadvertently created the dollar sign.

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

The house where the writer spent his formative years.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

The modern birthplace of Irish freedom.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

A hugely vast Irish landscape of barren rock that stretches for miles.

A remarkably intact castle that once was the largest in Ireland.

Northern Ireland's Brobdingnagian stepping stones.