This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A small Wyoming town is home to the state's oldest-operating soda fountain.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

One of the smallest towns in the United States.

Preserved behind glass, the ruins of a medieval building used to store human remains.

A giant green dragon crawls down from the roof of the Providence Children's Museum.

One of the largest publicly funded mural in the country is one city's love letter to itself.

This picturesque abandoned home is rumored to be a spite house.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

A fiery crater has been burning in the Karakum Desert since 1971.

The former home of elite checkers battles of the Capital Pool Checkers Club.

Inspired by the colossal pyramids at Giza, this 15-foot structure is believed to be the first funerary pyramid in Great Britain.

An unassuming secret door once led to a legendary watering hole.

The quaint little Vermont town played a quaint little Connecticut town in Tim Burton's "Beetlejuice."

This permanent exhibition of commercial signs aims to preserve the cultural heritage of the city.