Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

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

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

This overlooked street light once served as a KGB dead letter box.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A naturally mummified 2,000-year-old man.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

A Roman spa buried deep beneath the City of London.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

An unusual round church in London with a Templar past.

Rebuilt remains of a temple to Roman god Mithras.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.