Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

This abandoned hospital is one of the most haunted places in Costa Rica.

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

This Costa Rican topiary park is a surreal garden of unearthly delights.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

This 15th century pharmacy displays a beautiful collection of ancient medicine jars.

A Romanesque tower appears when water levels drop.

This ancient Spanish castle sits high upon a hilltop.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

The 20-mile causeway that separates the Netherlands from the sea.

This Roman arena once played host to bloody gladiatorial battles.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

Long tunnels run under the ancient chariot racing circuit to the tower.

Stunning Roman aqueduct used for 1900 years and still standing.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

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

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

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.