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

Arrr! The most authentic collection of pirate artifacts in the world... matey.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

The remnants of an abandoned, 19th-century gold mill along Aruba's rugged northeastern coast.

The site of a devastating modern-day mud volcano eruption that buried parts of a village.

This replica medieval European village in the Dominican Republic was built by a Hollywood set designer.

You have to know where to look in this rather ordinary-looking square to find hints of its past as a dissidents' cemetery.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

A celebration of Colombia’s premier contemporary artist.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

Giant topiary dog once played a role in a terrorist bomb plot.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.