Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Giant, friendly pelicans in Central London, the most unlikely of places.

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

The remains of Crystal Palace Great Exhibition of 1851.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

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

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

One part local history, 99 parts gruesome haunted house.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This abandoned Belgian fortress is purposefully being left to nature.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Formerly a lovely white sand beach this Hawaiian stretch is now a trap for countless tons of trash.

This black shoreline is made up of exploded lava particles.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

No need to strap in for a "ride" on this walkable roller coaster.

This concrete church spent a period of its history as a World War II bunker.