This volcanically volatile island town is home to an abandoned series of tunnels left by the Japanese during WWII.

This secret facility trained seals for the Swedish navy during the Second World War.

A network of fortifications that never saw conflict.

Remnants of the Nazis' occupation of Denmark linger along the sand.

Two World War II aircraft lie within the jungle around this abandoned runway.

A surprisingly beautiful abandoned World War II military base in East Greenland.

The site of one of Japan's very few American occupations during World War II still holds the relics of a roundly disastrous campaign.

This 19th century Sioux City candy company is the home of the Twin Bing, a historic, chocolate-covered treat.

A lonely monument to the original Silicon Valley tech campus.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

The Mighty Wurlitzer organ continues to belt out the tunes at downtown El Segundo's historic home for silent and classic movies.

Concrete igloos standing across from what remains of the Michigan Central train depot.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

A crumbling ghost town on the South Dakota prairie.

One of the largest private collections of fossils in the world.

The Old Man of the Mountain’s less-famous, but still beloved little brother is said to resemble a leader of the Abenaki tribe.

Come for the gun-toting hillbilly madman, stay for the ice-cream loving basketball bears.

A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

Even Henry David Thoreau found this glacial pothole irresistible.

The life of one of America's pre-eminent painters is frozen in time in the home where he lived, worked, and died.

This unconventional used book store was once in the news for the surprising act of burning books.

A beloved, quirky little fountain featuring a large frog spitting water at a naked boy.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.