This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.

This abandoned fighter jet launch center is now a haunting street racing course.

Tombstones buried in overgrown grass mark the deceased occupants of this abandoned graveyard.

Wars fought and wars won are remembered by these abandoned bunker ruins.

Man-made mineral caves house massive bat colony.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A decommissioned submarine base makes a great space for graffiti art.

The gutted remains of this Estonian mansion are a monument to a tragic love.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

Legend has it fairies gathered at the site of this medieval castle.

Traces of the thriving lake trade that once linked the Soviet Union with Mongolia.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

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

All aboard the world's longest miniature railway.

The ruins of this prominent glass factory yield hidden treasures buried among the jungle floor.

A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

The rust covering this old mine's abandoned buildings matches the red pigment it once produced.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

This Victorian marvel of engineering and artistic prowess is nicknamed the "Cathedral of Steam."

A brick foundation and piles of listing building materials are all that remains of this World War II POW camp.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

For one day every month Barcelona's Estació de França transforms into a market for model trains.