The largest freshwater lake in the Florida Keys.

When you can't get to the Pacific, just go to Florida.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Medicinal spa created with the discharge from a geothermal energy plant.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Experience what life was like in Ireland during the Viking and medieval ages.

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

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

The museum chronicling a treasure hunter's dream, fulfilled.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

A monument celebrating the idea of reaching inaccessible places.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Former villa and estate of James Deering developed to preserve native tropical forests.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Week-long block party becomes a competition for the best decorated street.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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