Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

Perhaps the most spectacular grotto along the Algarve coastline.

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This Canadian monument to the man who invented the telephone allows visitors to get up close and personal with the artifacts of his life.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Uninhabited islet in the Caribbean is the sanctuary of giant lizards.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

After Christopher Columbus died, his son built a fancy house to rule from.

Built in 1512, the oldest cathedral in the Americas.

The final resting place of Christopher Columbus - or possibly someone else.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Collection of fossils, plants, and ancient animals encased in amber.

A tomb in this cemetery holds soil from every country in Latin America.

The highest peak in all of England is plagued by dangerously fickle climate shifts.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

The largest of only eight working transporter bridges left in the world.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

This historic Benedictine monastery brews a booze so toxic that it has often been blamed almost singularly for Scottish hooliganism.