This uninhabited island in Maine is home to various works of art left by visitors over the years.

Spend a day hanging out with domesticated Russian foxes.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Colombia's biggest botanical garden contains plants from all across the country.

This elegant neoclassical garden is a peaceful oasis in the middle of the Nepalese capital.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

This park feels like a lush little jungle full of wildlife nestled within São Paulo.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

The ruins of an unfinished explosives factory can be found while taking a gentle stroll through a Manx glen.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

The tangled roots of a giant banyan tree have fully reclaimed the ruins of this abandoned warehouse.

The ruins of a fairytale castle with a tumultuous history stand high atop the mountains.

This delightful hidden farm is home to Victorian ruins and a wonderful menagerie of animals.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A mysterious set of tunnels carved in the hills of rural northern Kyushu.

This mesmerizing, colorful structure looks like a tent made from stained glass.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

A nearly abandoned 19th-century town on the Palouse.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

A fifth-century temple improbably built into the side of a cliff.