This labyrinthine resting place of Black American leaders has been reclaimed by nature.

A mouldering Colombian bull ring stands as a reminder of the country's complicated relationship with a brutal sport.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

New Orleans' famous cemetery, located on the site of a former race track.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

An enormous park-like oasis, full of famous Chicagoans’ graves.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The trials and tribulations of marking Poe’s grave.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

The ornate miniature mansions were built for Istanbul's feathered residents.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A meow-velous tribute to a beloved street cat, made famous on the internet.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

A section of the long chain that blocked enemy ships from entering Constantinople.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A fountain standing as a testament to a doomed alliance.