Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

Swedish skyscraper with a 90° twist.

The world's northernmost aquarium looks like it has fallen over.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

The world's northernmost botanic garden has 25 collections of plants from arctic and alpine regions.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A six-ton wedding present for the King of the Scots.

A typographic tribute to the many comedic greats who make Great Britain laugh.

An open air haven for tropical monkeys in the damp moors of the English country.

This fantastic museum honors Gloucester waterway heritage.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

The painting on an aptly named street honors the 1980s slasher movie.

The castle still holds traces of the abandoned Roman fort it was built atop.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

A grand mansion in rural mid-Wales gifted to the Welsh people by two sisters.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.