An alley way dedicated to graffiti and street art is a constantly changing street gallery.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

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

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

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

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.

Once home to a thriving oil industry, this town now sits eerily abandoned.

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

Over time, this castle grew to encompass the entire island.

Before he was America’s most famous preservationist, John Muir was an ingenious mechanical inventor.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Ninety years of Sydney buses under one roof.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

Historical figures from New York City's Catholic community reside in Midtown.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

One of the largest private collections of cars manufactured by the short-lived Franklin Automobile Company.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.