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

A priceless collection of the Nation's cryptologic history.

The land is home to swimming ponies and a legendary 18th-century treasure.

An eerie, decaying ghost town destined to fade into the forest.

An astounding collection of medical specimens, including bits of President Lincoln.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A collection of artifacts from Maryland's maritime past.

A small 19th-century graveyard tucked away in the middle of a suburban neighborhood.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

This free, take-a-book shop seems like a trick but isn't.

The trials and tribulations of marking Poe’s grave.

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

Once a train station along the Great Eastern Railway this vibrant coffee shop and bar is where members of London’s creative class mingle.

This luxury shopping lane has been protected by its own tiny police force for over a century.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

Pop culture has helped to keep this iconic British building from being destroyed.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

After nearly 60 years, there's still a bear at Paddington Station looking for help.