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

What is it about mushrooms that makes people wish they lived inside of them?

The first tourist attraction to offer tours for interstellar tourists.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The Emperor Tiberius' palace of debauchery.

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

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

A trading post in the North Pole where children send letters.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

The rocks in this arid basin leave trails of movement behind them.

This small primate research island is teeming with playing, fighting wild monkeys.

In paradise, feral pigs have claimed an island all to themselves.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.