A collection of 11 million buttons illustrates the human toll of the Holocaust.

This softly rounded mansion was built without corners not to avoid evil spirits, but to make them more comfortable.

To find the "unicorns of the deep" you've got to go downstairs.

These pretty kitties killed and ate as many as 135 railway workers.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

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

Known as "The Hill of the Little Devils."

These cliff and rock formations are made out of Sioux Quartzite.

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.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

Despite sitting firmly in the global cradle of the Church of Jesus Christ of Latter-day Saints, this Hare Krishna temple is host to one of the largest color festivals outside India.

The largest island on the great salt lake is home to curious creatures and strange stories.

The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

A bypass decorated with large wooden troll carvings.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

More than 5,000 contemporary and "historic" mustards from around the world.

This striking art museum holds an amazing series of curiosity cabinets.