A thorough look at the development and history of the underground's rolling stock of the Madrid subway system.

This museum is known as the "Land of the Dinosaurs," but its full-scale dino models are just the start.

Cliffside houses provide a spectacular view from their perch above the valley.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

From grand battles to daily life, this Spanish museum offers a view of world history in miniature.

The odd cement nubs littering this Spanish square are actually the entrances to a series of buried silos.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

This house's itty bitty size means no humans allowed.

This architectural oddity is an oasis of green on the outskirts of Valencia.

This abandoned viewing platform has become a monument to unnecessary government spending.

A curious fountain that resembles a beloved character from the 1960s.

A copy of the brutal decapitation device that predated the French Guillotine by about 200 years.

The fossilized trunk of a tree that grew around 320 million years ago.

This now museum began supplying water to Sunderland during the mid-19th century.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

A tiny chapel perched along a 14th-century bridge.

A stretch of land where the sour-sweet vegetable is cloaked in darkness and grows so fast you can hear it crack, squeak, and pop.

When the city of Manchester built a new centralized heating network, they did it with style.

An obscure walkway dedicated to a scientist who helped pave the way for the world to sit up and take notice of Manchester.

This building's name and a plaque are all that's left of what was probably the most important nightclub of the Madchester music scene.