The walls of the iconic dome are hollow and have a secret stairway.

A celebrity from the late Cretaceous period.

The last bastion of Roman presence north of the Alps looms over a German town.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

The gargoyles and grotesques of the 21st century are here—22 emoji built into a new building in the Netherlands.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

There’s a special club house at the top for the bell ringers.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Look closely and you’ll notice that the color changes a third of the way up the tower.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

A surreal statue honoring Prague's favorite literary son.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

A little known pile of scraps and plaques mark the grave of a downed RAF bomber.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.