The world's largest model of our planetary system.

Wallabies live naturally on this Irish island.

A series of sculptures beneath the waves promote ocean conservation and support coral reefs.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

An Australian lake whose pink hue defies scientific explanation.

Incredible rock formations jut from the southern end of this spectacular stingray-viewing spot.

This pair of Australian "waterfalls" appear to be falling straight across the land.

This Australian beach is composed of tiny shells.

A massive concentration of algae is responsible for this lake's pink hue.

An abandoned marine theme park has created a difficult experiment in dolphin rewilding.

The world’s largest knitted mitten is displayed in one of Sweden’s smallest Arctic villages.

The concrete skeletons of an abandoned Swedish town hide among the trees.

A geological wonder that helped fuel myths of trolls and giants.

Said to be one of Sweden's most haunted places, this vicarage once even attracted a ghost-busting priest.

On an island south of Iceland, a large volcanic rock formation resembles an elephant.

Early habitat dioramas and home of the elusive gaff, the skvader.

Bell tower juts out from a village buried under a lake.

A 200-year-old collection of medical paraphernalia in a historic house.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Medicinal spa created with the discharge from a geothermal energy plant.

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

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.