This modest post office sits on the site of H.H. Holmes' famous murder castle.

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

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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

This museum remembers an apocalyptic cult that became more famous for baseball than religious radicalism.

The remains of a religious colony, its amusement park, zoo, and baseball empire.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

Outside Grand Valley State University, you'll find a bench upon which many were said to have sat according to the fictional Kcymaerxthaere, waiting for a guide of time.

The museum moved on, but the diorama remain.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

A park and memorial dedicated to the victims of the deadliest school massacre in American history.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

Willy Wonka would love this weird half-a-home.

Secret Swing.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

This Toronto garden collects stares and tchotchkes in equal measure.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.