These pretty kitties killed and ate as many as 135 railway workers.

First planned industrial community in the United States.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A lush green oasis in the middle of Chicago.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

An antiquated German apothecary on Chicago's North Side.

An enormous park-like oasis, full of famous Chicagoans’ graves.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A speakeasy takes on Chicago's drinking culture.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The 25th President's marble casket can be visited in this classical Ohio tomb.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

Washington's iconic carousel has a nice piece of Civil Rights history.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Before Nixon, "watergate" meant canals.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.