In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

What was meant as an innocent piece of art has earned a reputation as the "mansplaining sculpture."

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

A lonely beacon, precariously perched atop a remote sliver of rock.

These quaint French houses dangle precariously over a precipice.

A fifth-century temple improbably built into the side of a cliff.

A castle perched precariously over the Crimean Sea.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

A historic observatory precariously perched at the "Top of Europe."

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

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

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

There's an exclusive Beefeaters pub hidden in the Tower of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

Sleep in a glass pod dangling off a cliff.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.