The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

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

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

Legend says this sacred tree was a gift from goddess Athena.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This Little Rock legend has survived decades of rowdy crowds, three fires, and a zombie wedding.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

This building contains handprints that are well over a century old.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

This impressive Boston holy house is the American mecca for Christian scientists.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Couple's personal collection of pinball machines turned public pinball museum.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A museum marks and documents the site of the Titanic's launch.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.