An abandoned saucer-shaped monument in the Bulgarian mountains.

Ozymandias’ time-keeping temple.

The Avenue of Mausolea is a series of grand palatial tombs.

The palace of the King of Kings, burned by Alexander the Great.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

The once great capital of Egypt now crumbles forward as evocative ruins.

A centuries-old fortress city lies in ruin.

An eerie, derelict amusement park in Berlin.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Jurassic theme park in the small town of Erlian.

Jurassic Park—A Still Life.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A complex of six forts embedded in the Rajasthan hills.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

Sacred Indian temple that’s all monkey business.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

An ancient artistic garden parlor full of hidden water wonders.

Spiral alpine structure provides an alternative experience of viewing the Matterhorn.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.