One of the world's steepest streets seems to have houses sliding down it.

This strange geological landscape erupts with sudden bursts of water.

The glacier tucked within a New Zealand rainforest.

A glacier pocked with ice caves and surrounded by rainforests.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Tubing through a cave lit with glowworms is a magical underground experience.

This sheep farm has been forever transformed since being built for “The Hobbit” film series.

Hang out with thousands of butterflies in one of the world's largest such enclosures.

The largest tea plantation in Southeast Asia supplies gorgeous vistas alongside tea for the surrounding countries.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A Buddhist theme park brings you a Buddhist version of Hell.

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

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

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

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

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.