Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

This piece of peacetime naval wreckage memorializes the tragic sinking of the USS Maine--an event which sparked the Spanish-American war.

Visit the monolithic tomb of America's most famous general.

Townhouse facade doubles as an RMS Titanic Memorial.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

America's first federal monument.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Supposedly Satanic numbers adorn this preserved submarine sail.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

Cemetery featuring rare glass-fronted columbarium.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

Along a California highway is a kind of Jurassic Park made of metal.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.