Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

The world's longest known cave system.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

A toxic ghost town sitting atop a massive coal fire.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

Local lore claims this park is named after a young woman who jumped off a cliff.

This ominously named New Jersey street seems to be attracting over-the-top legends of its own making.

This scout retreat, still in use today, was the filming location for the original “Friday the 13th” film.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

America's first public mental health facility.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This stunning concert hall has become a symbol of Iceland's national recovery.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

An encyclopedic collection of mammal penises.

An old dining hall now serves up ghost stories for lusty locals.