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

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

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

The world's largest collection of the world's largest objects is in one small Illinois town.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Less a museum than a bizarre fantasy world created by artists and engineers.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

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

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

This restaurant proudly displays bread signed by the 39th president.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

The origin of the Nixon tapes is rooted in technological incompetence as much as secrecy.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

An abandoned quicksilver mining town surrounded by the Big Bend parks.