The most decorated dog of World War I is preserved in the Smithsonian.

The walls of the iconic dome are hollow and have a secret stairway.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Roses and other fascinating flora fill this garden built to commemorate Britain's immortal Bard.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

The palatial McDonald's that inspired Wesley Willis.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

Huge abstract sculptures of the Puerto Rican Flag.

A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

Chicago was once a major hub of film production, but being silent film you don’t hear much about it.

The oldest house in Chicago certainly doesn't look the part and there are some who say it doesn't deserve its title either.

A military museum and library dedicated to the citizen soldier.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

No one knows how many bodies are in this vault in a Chicago public park.

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