A 19th-century architectural wonder designed by the "father of the skyscraper."

The home of the first American-born saint is one of the only curved buildings in New York.

On the Hudson resides one of the largest clocks in the world.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

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

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

The absurd creation is a compulsory destination for selfies in Buffalo.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A contemporary fresco movement illustrates the region's rich history.

A natural gas leak provides a flickering flame beneath a waterfall.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

One of the largest festivals of flowers in North America takes place, appropriately, in the Flower City.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Step back in time on this preserved 1800s farm.

This chilly Canadian hotel has a four-month lifespan due to the unusual material it's made of.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The site of Paul Revere's historic two lantern warning.

Island where motor vehicles are banned -- home to the only carless highway in the United States.