A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This small fort played a huge role defending Puerto Rico’s capital city.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

This small primate research island is teeming with playing, fighting wild monkeys.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The world's brightest bioluminescent bay.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

The ghostly remains of what was once the world's richest copper mine.

This striking structure is the Socialist-modernist centerpiece of a former Soviet spa resort.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

Launch site for nuclear war against Western Europe.

Once known throughout Europe, this tiny and unusually progressive 18th century micro-nation within Lithuania now lies in ruins.

What almost started out as a spite house became an eccentric's found object masterpiece.

Ever-growing collection of devils in art.

A memorial to the murdered Jews of Kaunas.

Sculpture garden of religious statues made it through Soviet rule.