This metal tower in the desert provides views of a handful of Nazca geoglyphs.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

The most complete statue of this Aztec god sits a top a throne carved with images of hallucinogenic plants.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

This Dutch art piece became a Russian icon.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

The remnants of a WWI naval mine that once terrorized the country now decorates a street.

This century-old street sign is a forgotten remnant of the old city.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

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

This curious, round temple is the oldest still-standing marble building in Rome.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.