An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

Dr Barnes' $25 billion private collection of art and arboretum.

Among the may artifacts on display is a clock made of 50,000 individual pieces of wood.

This vintage short line in Amish country runs passenger steam train excursions and still hauls freight.

A huge railroad museum with over 100 pieces of rolling stock focusing on the railroad history of Pennsylvania.

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

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The U.S. Fish Commission’s effort to mass produce carp.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Designed as a reminder of one of the darkest moments in Austrian history.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

These two 15th-century metal rods allowed people to check if they were swindled or not.

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

The solemn exterior conceals an opulent interior of this 17th century church.

These relics of the city's past now exist as a prominent modern feature.

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

The medieval network of canals hidden underneath the city is opened to explorers each year.

This medieval church in a small Austrian village is home to a 700-year-old Mickey Mouse lookalike.

A men’s restroom became a sandwich shop.

This statue intended for children to enjoy became a minor political spat.