One of the world's oldest continually operating bookstores.

This early 20th-century rural drinking fountain provides water for both horses and humans.

The smallest covered bridge in Maryland.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Abandoned silver mine strewn with wrecked and twisted structures.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

This massive library holds what was once the largest book collection in the world.

On a corner of the Ardmeanach peninsula on the Isle of Mull, a 50 million-year-old fossil tree hides in the coastal cliffs.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Replica of an old Esso filling station, complete with Wayne gravity pump and outhouse.

This "living building" on Georgia Tech's campus is home to a blueberry orchard, honeybees, and more than 900 solar panels.

A slanted tomb honors the faithful, furry companion of the Georgia Tech student body.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

The skeletal white beams stand as a monument to religious dissent.

The world's largest otter started his life as a high school shop project.

A century-old historical movie theatre that plays a mix of independent and mainstream films.

Chronicling the history of Thailand’s unique currencies, from the silver “bullet money” to porcelain gambling tokens of various shapes.