Cliffs that hold fossils, including the earliest known reptile, dating back more than 300 million years.

This restored opera house is named after a soprano known for tragic romance, exile, and a truly uncomfortable wedding.

This bridge over the River Cuale leads to a neighborhood that was once an escape for Hollywood's elite.

From Nunavut to Tierra del Fuego, you won't find any lighthouse higher than this one.

A wild Hollywood resort thwarted by mosquitoes.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

These azure waters were thought to lead to the Mayan Underworld.

Neo-cave art on the macro scale.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A Spanish-style estate that has traded black ties for rock concerts.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

A crazy maze of a hostel, where every trap door and secret entrance brings you to a new wacky, wonderful room.

Think you have a tough job? Try carrying 200 kilos through a cloud of sulfur down the side of a volcano.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

Hindu temple of the dead home to hundreds of long-tailed macaques.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Macabre astrological automaton clock dating to the late 1400s.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

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