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

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The ancient tomb acts as a calendar that keeps perfect time.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

Formerly secret, precariously perched boulders.

Glacial erratic or man-made dolmen? It probably wasn't druids.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.