Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

This medieval city gate is now a blend of the past and the modern world.

Ancient ruins hidden underneath a modern luxury hotel.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A small part of lower Manhattan is actually made from a bit of England.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

This museum explores the grim reality of life in the earliest British colonies in America.

This unassuming home played a pivotal role in American history, essentially putting an end to the Revolutionary War.

The location where the American Revolution ended.

Step into the courtroom to learn details of the only case in history where ghostly testimony led to a murderer's conviction.

Next to Salt Lake City's Assembly Hall stands a tribute to some unlikely heroes of early Mormon settlers.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

Hear the roar of the engines and the crowd at this nearly 90-year-old Pennsylvania track.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

A 20-foot-tall quarter commemorates George Washington’s ties to Bedford County.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.