One of the few working locomotive roundhouses in the United States.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Millions of numbers carved in glass represent the tattoos forced upon victims.

One-time largest man-made structure in the world will be a park in 30 years.

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

Steinbeck's old stomping grounds, immortalized in Cannery Row.

This classic steam-powered train takes tourists on a nostalgic trip around the Connecticut River Valley.

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

This supermarket is suspended 25 feet above an interstate highway.

The only surviving fragment of the lost Narragansett Pier Casino.

This futuristic German television spire is actually the world's largest digital clock.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

The real faces of Venice beach captured on Romanesque columns.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

The seat of Buffalo government is a gorgeous Art Deco palace.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.