A hot dog stand where the heads are just as hot as the dogs.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

Yo, Adrian!

The land is home to swimming ponies and a legendary 18th-century treasure.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

The world's largest piece of copyrighted artwork.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

The only remaining place where you can play this century-old game for cash.

This small shop walked so America could run on Dunkin'.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This unusual lava tube spouts seawater during high surf.

This blowhole is supposedly caused by a trapped monster.

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.

The tunnel under the Capitol Building where Congress takes out its trash.

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

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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.