A Los Angeles cemetery that was once at the center of a Supreme Court dispute.

Pay your respects to departed pets, both celebrity and otherwise.

A multimedia experience that chronicles the atrocities of racism.

Most famous work of one of Frank Lloyd Wright's sons.

A library of rare occult books in Los Angeles.

The legendary building that needed ghostly approval before being built.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A fairy tale castle in modern Rome.

Ancient ruins hidden underneath a modern luxury hotel.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

Obscure Freemasons still live in D.C.’s largest private residence.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

There's a crumbling old mansion inside the Smithsonian National Zoo.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The oldest continuously operating fish market in the United States.

The most decorated dog of World War I is preserved in the Smithsonian.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

Many famous English poets including Elizabeth Barrett Browning are laid to rest at this Swiss-owned cemetery in Florence.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.