Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A toxic ghost town sitting atop a massive coal fire.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

The freeway that never was.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

San Diego's most historic and haunted home.

Its buzzing collection honors vibrator history.

A macabre tour of Hollywood’s deadly history.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

Medical and zoological curiosities for sale.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Pay your respects to a folk-punk legend.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.