The ruins of a once prosperous power station have become a mouldering seaside gem.

A huge stone pyramid built for fun.

A forest full of mystical fantasy figures, nearly destroyed by recent fires.

This secret Australian garden was built on love after a man planted a random bulb he found in the ocean.

These Australian rock formations look like Martian beehives that have grown up out of the landscape.

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

An incredible garden taking over the interior of a massive sinkhole.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

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

An abandoned railroad tunnel is now filled with bioluminescent bugs.

Small French town or alien garage?

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

French commune at the heart of conspiracies.

An abandoned nightclub has become a vibrant work of art.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Historic medieval fortified city in southwest France.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

The deserted pirate-themed restaurant still entices explorers.

Tiny artwork tucked within glass letterboxes form this hidden gem of an art gallery.

One of the oldest theaters in Australia, it's also said to be haunted by a performer who died on stage.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.