It might not be as impossible to reach as its name would imply, but just about.

The intended purpose of this unfinished Elizabethan building remains a mystery.

The world's tallest box hedge is found in a delightful garden.

An imposing Omani fortress surrounded by date palm trees.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

The ruins of a grand theater destroyed during the most powerful seismic catastrophe ever recorded.

Beautifully carved tombstones fill this unmarked graveyard, uniquely situated near the village's famous stone wine cellars.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

This abandoned Brutalist treehouse is a hidden architectural relic.

A 17th-century church is nestled within the walls of a 15th-century ruin.

Giant jewel-toned statues fill the grounds of this Cambodian Buddhist temple in California.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

A remote desert lookout offers unparalleled views of the California badlands for those who brave the trek.

A vibrant street away from the typical tourist track, lined with colorful, mosaic-covered houses.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

Peru’s only toy museum houses everything from pre-Inca whistles to lead soldiers and terrifying dolls.

The place where the great marine explorer first learned to work underwater is not where you'd expect.

Grotesque statues of figures from Buddhist hell haunt the temple's Sin Park.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.