Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

This vast kitty-themed collection illustrates the history of human-cat interaction.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

Home to the "Circus" trees created by Axel Erlandson.

The kind of mixed-up place that drives archaeologists crazy.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

An original apothecary from 1792.

Community owned and operated, this property is home to a diverse set of nudists.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

The fossilized remains of ancient California redwoods.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.