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.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

Nothing says indulgence like a 1,500-pound chocolate castle.

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

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

A beautiful oddities shop crammed with strange and morbid curiosities.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

On the roof of the oldest department store in Tainan stands a Shinto shrine dating back to the 1930s.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

Home to a vast and influential collection of Shakespeareana.

Marine fossils from the Devonian period are exposed at this park.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

These unusual rooms on wheels are holdovers from the 1960s.

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

The colonial home of Paul Revere during the American Revolution.

Bizarre Cavern.