Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

All of Chicago's wood-paved streets are long gone but two alleys remain.

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

This historic hotel invented the chocolate brownie.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

The beloved home to all publications indie, erotic, and punky.

A hollow cement depiction of time's inexorable effect on the human body.

A Bibliophile's Dream.

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

A lush green oasis in the middle of Chicago.

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

On the site of a former Army ammunition plant, bison now roam a restored sea of grass.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

The first park built over a freeway is a brutalist masterwork.

A wall of chewing gum moonlights as collective art.

This former coal gasification plant found a curious second life as a popular public park.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The national park was once a plantation estate.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.