This library and museum is dedicated to the life and literature of the Indianapolis native author.

One of the few beardless depictions of Lincoln, George Grey Barnard's 1917 statue was denounced by many—including Lincoln's own son.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The only surviving fragment of the lost Narragansett Pier Casino.

Tiki luxury on Nob Hill.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The bronze uniforms commemorate the vital role of women during World War II.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The commemorative stone column conceals a secret laboratory.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

An architectural oddity hides in plain sight on this iconic London bridge.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

Hidden in plain sight, this creepy sculpture watches from above.

A statue of the original Pearly King is hidden in a church's crypt.

This coffee shop lies hidden beneath a historic church.

London's smallest police station is barely the size of a phone booth.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.