A haunting theme park is slowly being swallowed by the jungle.

Visible from both land and sea.

Come for the flowers, stay for the bats!

This historic observatory contains the world's oldest refracting lens telescope.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

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

Alien rock formations grown from the sands of an Australian national park.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

A church of bones, decorated with 40,000 human skeletons.

An enormous and lavish Gothic church in Czechia.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Monument to a suicide protesting the Soviet invasion.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The most visited, and possibly most controversial, museum in Germany.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

An underground city of salt.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.