The collection includes seven one-of-a-kind automobiles, vintage fashion, and more.

This monument traces the segregation line that inspired the first rural branch of the NAACP.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

More than a century old, this trading post resides in the Navajo Nation.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

With a floor made of thick glass, this observation deck offers a full view of Sunwapta Valley's mountains and rivers.

A seven-ton black granite monument dedicated to the memory of those who died and those who lived through the 1977 crash of the popular Southern rock band.

A giant mascot, a car bomb, and the mafia mingle in the history of a defunct restaurant chain.

The bad-ass ride of a soul legend, housed in one of the world's few soul museums.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

This unassuming Massachusetts residence was built with a trap door to hide escapees on the Underground Railroad.

People escaping slavery passed through the oldest house in Lombard, Illinois on their northbound journey to freedom.

This unassuming home was once “grand central station” for the Underground Railroad.

Perhaps the most spectacular grotto along the Algarve coastline.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

Off-limits and full of venomous pit vipers, Brazil’s Snake Island has a frighteningly apt nickname.

Norway has built what may be the world's most beautiful public toilet.

A limestone sculpture of a praying man resides over the site where 23 Chinese cockle pickers died.

This old-fashioned carhop restaurant gave the world the waffle cone.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.