Dakota legend claims this locally iconic pinnacle was once part of a sacred burial site that was cleaved in two.

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

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

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

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

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

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

One of the largest trees of its kind in California.

Small-town museum dedicated to outer space ... and bicycles.

No one's quite sure where this quirky university tradition originated.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

The only arched bridge made of stone on the entire Mississippi River.

A cemetery housing wild west legends in South Dakota.

A fitting attraction for the corn capital of the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

This large midwestern cavern features impressive rock formations and an underground waterfall.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.