This fairytale-like structure is the last turf church ever constructed in Iceland.

The oldest church in Iceland is one of the few to feature ornate decoration.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

Rising from the sea like a stone monster.

Walk in the footsteps of the gods and straddle two tectonic plates.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

The oldest surviving presidential residence in the United States.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

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

The world's longest known cave system.

The highway's southernmost spot is a beloved local attraction.

It's a pretty creepy lock-up.

A monument celebrating the idea of reaching inaccessible places.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

This defunct, fortress-like prison has been the setting for several movies.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

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

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

This replica of the Greek structure is in the heart of Nashville.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Home of an evil witch famous within southern folklore.