See massive fossils that are over 200 million years old in northeastern Arizona.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Complex aquaponics systems allow fish and plants to grow in harmony.

Where old school Polish Chicago and young hipster Chicago live side by side.

A monument to the art of slicing people open.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

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

The biggest drug trafficking passage between Mexico and the U.S.

A blooming house of worship for the masses.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A bizarre house filled with an astounding array of collections.

Largest gathering of hobos in the country has been meeting annually since 1900.

An old town theater converted into a celebration of the hobo legacy.

The private clubhouse for the members of the Academy of Magical Arts.

Jesus' footprints and the first catacombs in the world.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

2300-year-old Roman road connecting the empire.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Abstract dinosaur models in London.