An ancient Egyptian temple in the middle of Madrid, Spain.

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

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

A curious memento mori hangs in the magnificent Cathedral of Segovia.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A former utopian healing center created by a huckster and built by derelicts.

A clear blue swimming hole with hidden caves, still unexplored.

A museum dedicated to the alleged Roswell Incident.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Iceland's tribute to its thankless civil servants.

This stunning concert hall has become a symbol of Iceland's national recovery.

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

Nature's biggest mammal swims in landlocked Oklahoma.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.