The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A Prada store in the West Texas desert that is never open for business.

Minimalist modern art on a repurposed military base in rural Texas.

Mysterious glowing orbs float through the desert night.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

An office built to look like a giant basket.

A massive sea stack famous for its appearance in The Goonies.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Olfactory delights in San Francisco's Botanical Gardens.

Golden Gate Park's historic collection of plants.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

The modern birthplace of Irish freedom.

A hugely vast Irish landscape of barren rock that stretches for miles.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

Northern Ireland's Brobdingnagian stepping stones.

The ancient tomb acts as a calendar that keeps perfect time.

One of Ireland's most infamous prisons for rebels including men, women and children.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Huge winged monument in the United Kingdom.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

The only structure left with direct ties to the Salem witchcraft trials of 1692.