Thirty creepy ghosts now inhabit this decaying 14th-century church.

A former squatter's paradise outside Prague.

A haunting deserted hotel is a favorite with artists and photographers.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

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

The now-overgrown beach resort was once frequented by Yugoslav military elite.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

The abandoned military base looks like a post-apocalyptic wasteland.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

This enchanting hamlet carved into the rock looks like something straight out of Tolkien's Rivendell.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

The abandoned summer estate of the former Greek Royal Family.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This beautiful train graveyard is one of the largest collections of steam locomotives in the Mediterranean and Europe.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

An abandoned 17th-century baroque hunting lodge with a wonderfully strange architectural plan.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

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

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