The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

The world's largest anatomically accurate brain sculpture.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

Ornate limestone building now filled with geologic specimens, and more.

Where hikers on the Tecumseh Trail can exchange a dirty sock for a free geode.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

The former home of elite checkers battles of the Capital Pool Checkers Club.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

This historic boathouse was constructed using salvaged lumber from burned barns.

This midcentury chapel is a bold architectural statement and a symbol of Indiana's Lutheran heritage.

This bridge was constructed from the remains of the first Ferris wheel.

Train cars and railroad artifacts abound at this restaurant devoted to railway history.

Walk in the footsteps of the famed astronaut at Purdue University.

Purdue students would lean over this iron fence to skirt campus rules against smoking and courting.

An unknown number of cholera victims are buried in two nondescript graves.

This stately clubhouse has showcased German-American culture for over a century.

This whimsical park encourages its visitors and wildlife to roam on and around the various works of art.

The largest historic preservation organization in the United States.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

Nature and art meet in this curvy creation

This elaborate estate contains a stunning marble aviary, a sunken conservatory, and a magnificent music room with a two-story pipe organ.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.