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

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A celebrity from the late Cretaceous period.

There’s a hidden military meme engraved on the World War II Memorial.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A hidden three-foot-wide house separates these two regal churches.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This giant sculpture made of trash is a critique of society's wastefulness.

An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

This collection of lakeside pagodas and temples are flanked by giant lions, tigers, and dragons as well as their welcoming maws.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

The trials and tribulations of marking Poe's grave.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A former major munitions plant that has been converted into a sprawling art space.