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

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

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

Also known as the Osaka Garden, this garden was originally built in 1893 as part of the World's Columbian Exposition.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

To find the "unicorns of the deep" you've got to go downstairs.

These pretty kitties killed and ate as many as 135 railway workers.

This open-air spiritual sanctuary offers stunning views of Mt. Monadnock and provides a natural and peaceful environment for worship and meditation.

New Hampshire's first neighborhood is now preserved as a historic village with live action role players.

The massive Roman arch in New Hampshire that was meant to be a tomb.

A real-life hidden Easter Egg in New Hampshire's capital city

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

Critics argue this boab tree has been mislabeled for the sake of dark tourism, undermining its spiritual significance.

This impressive Boston holy house is the American mecca for Christian scientists.

Dedicated to one of the darkest moments in Irish history.

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

All that remains of the former site of the final home of president Franklin Pierce.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Plymouth's huge yet little-known memorial to the Pilgrims.