Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Quite simply the largest tree in the world (by volume).

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Monasteries on rock pillars, once accessible only by frayed ropes.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

This frequently-photographed waterfall takes only a short hike to visit.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A gorgeous gilded tower houses what may be the world's largest collection of gin.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

A brush maker used his factory to protect blind Jews from the Gestapo.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

This classic restaurant features a gorgeous mirror-clad room.

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

This fantastical waterfall is hidden in a cave located in a cracked cliff.