Step inside Lucy, the world's largest "elephant."

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Watch the newest land on the planet form before your eyes.

This black shoreline is made up of exploded lava particles.

These ancient sacred grounds granted amnesty to those who managed to reach them.

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

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

The world's smallest drawbridge.

Secret refuge and museum of the Duke of Florence.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

The home of aviation trailblazers, in a remote corner of the big city.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.