A striking 12th-century-style castle built on the edge of a cliff.

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

Handcrafted thermal spa washes away each night with the tide.

One man's dream has turned into this naturally growing chapel made of almost nothing but trees.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

The once and future home of New Zealand's famed Pink and White Terraces.

Deadly scalding and one of the largest hot springs in the world.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The platform atop this verdant volcano was built with the help of a royal elephant.

No need to strap in for a "ride" on this walkable roller coaster.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The narrowest street in the world is in danger of closing up entirely.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The great Danube river starts here.

Legendary site where an evil bishop was devoured by rodents.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

The world's biggest pet store.

The last bastion of Roman presence north of the Alps looms over a German town.

This painted Lego bridge is the product of over a century of locomotive history.

Cold war icon and onetime "hole" in the iron curtain.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.