An enormous, inside-out glass globe built in 1935.

A temple dedicated to the 13th-century Alevi Turkish dervish credited with bringing Islam to the Balkans.

In this town's main square resides a statue of none other than the 43rd President of the United States.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

This former football stadium seems almost abandoned but is still in use by the next generation of Scottish sports stars.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

Travel through the wholesome amusements of yesteryear at this charming miniature village.

This cemetery features modernist statues as strange as its name.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A completely underwater art museum sends a stark message about humans' impact on the environment.

Abandoned Italianate architecture on the coast of Maine.

Dramatic river bend surrounds a natural red-rocked pedestal.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

This Sumatran root bridge took almost 30 years to knit itself together.

Natural cathedral designed by Italian artist Giuliano Mauri.

Living trees form the structure of an open-air palace.