Early prototype for Frank Lloyd Wright's Guggenheim.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This landmark of the Chicago silent film industry may not be in the picture business anymore but it still stands proudly.

A hot dog stand where the heads are just as hot as the dogs.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

This is not your typical jungle gym.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This bookstore serves recipes from the cookbooks on sale.

The real clothing store that inspired a fictional spy organization's front.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

The building is topped by a Statue of Liberty statue whose torch has stayed burning since the museum opened.

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 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.