The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

The half-finished remains of what would have been Scotland’s biggest piece of landscape art.

Next to the Malaysian Prime Minister’s office stands this rose-colored mosque.

The oldest residential street in Europe also features an optical illusion.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

This mysterious ancient arch is hidden in the forest of Simbruini Mountains Regional Park.

This medieval hilltop village was abandoned at the end of the 19th century, after existing for more than 500 years.

The oldest candy store in the world has been selling traditional sweets since 1827.

Its vast collection details the history of this Santa Barbara beach town.

This serene bamboo walkway allows Buddhist monks from remote temples access to the nearby village.

One of Edinburgh's oldest pubs hides a 19th-century skittles alley in the back.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A slightly surreal menagerie of structures that were lovingly spared from demolition and reconstructed in a field.

This beautiful Miami garden was designed as a laboratory for tropical plants.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

A storybook European village in Berkeley.

The 953 windows undoubtedly make this the world's most beautiful screened porch.