All of Chicago's wood-paved streets are long gone but two alleys remain.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

You won't find these curiously named passageways anywhere else in England.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

This unassuming passageway played a key role in one of the most important events in U.S. history.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

The alley connecting two of country music’s most historic venues has a rich history of its own.

Also known as "Hell Alley," this tiny street in Imola gained its name in a bloody episode in the 16th-century.

A Roman calendar dating to the first century is tucked away in a small town alley.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

A small alleyway with an unusual moniker.

This historic patch of real estate offers a glimpse of colonial Boston.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

A 15-foot-tall statue of the head of the Sopranos family greets passengers at a train station in southeastern Lithuania.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Does this 10-foot-tall statue carved into a rock face depict a king afflicted by a skin condition or a Buddhist figure?

Inside this church is an obscure piece of art carved by the famous Alice Liddell.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

The former location of a platform that allowed passengers to safely wait for the trolley.

An abandoned stretch of elevated road in the middle of the Brazilian jungle.