A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

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

One of the largest underground systems runs under Canada's largest urban center.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Soaring over the Niagara Whirlpool since 1916.

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

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The world's oldest continuously operating airport was founded by the Wright Brothers.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A much-maligned monument to teetotalism.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.