A lush green oasis in the middle of Chicago.

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

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

Townhouse facade doubles as an RMS Titanic Memorial.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

This poignant display is now a memorial to these regionally extinct species.

This impressive scene portrays the elusive forest giraffe of Central Africa.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

This tiny store is your one-stop shop for all sorts of rare and wonderful buttons.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

There must be a pun in this haystack somewhere...

The site of the deadly Triangle Shirtwaist Factory Fire.

Commemorating the spot where the famous scientist fed his pigeons.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

A bit of retro transportation flair preserved in the world's largest department store.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Sniff the Titan Arum's rotting flesh.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.