An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

Ruins of a historic medical facility sits eerily by the water.

The abandoned tuberculosis sanatorium is said to be one of the most haunted places in Canada.

An abandoned, deteriorating tuberculosis hospital from the turn of the 20th century.

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

This abandoned hospital is one of the most haunted places in Costa Rica.

An abandoned tuberculosis hospital moulders on into an uncertain future.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

Enjoy egg rolls and live music in a converted bank vault.

This cemetery is home to numerous granite headstones that are works of art unto themselves.

America's first public lending library began with a gift from Benjamin Franklin.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

She become one of the first women to serve in the United States military by secretly dressing like a man.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

A sprawling maze of used books piled from floor to ceiling.

Not quite the menace it once was, this monster still has some chops.