Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

Nordic giants resurrected from the sea and restored to their former greatness.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

The bears of Bern have been a city highlight for over 500 years.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A priceless collection of the Nation's cryptologic history.

America's first federal monument.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.