This Civil War monument was designed by an eccentric architect and Gettysburg veteran.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

The only museum outside of Australia dedicated to exhibiting the artwork of Indigenous Australian artists.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

This restaurant's specialty is "a major enigma for food historians."

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

This historic building displays the remains of a victim of the devastating 14th-century plague.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

Look up from the busy streets to discover how time is kept!

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The attic of a four-century-old canal house hides a clandestine church.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The mirrored section takes the shape of Hebrew characters when viewed from above.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.