An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A sculpture serving as an homage to Pope John Paul II.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

Breathtaking and huge 430 year old maps of Italy.

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

Opened in 1976, this monster-sized version of the fast-food franchise is sometimes called the Epic McD.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Famously misunderstood wonder of the ancient world

The first archaeological site discovered by aerial photography.

This life-size monument honors the legacy of a famous literary feline.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

An unassuming London park is actually a pilgrimage site for modern clowns.

A small museum that celebrates the history and culture of the LGBTQ community in England.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

The world's longest continuously running show has played at this small West End theater since 1974.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

The final resting place to 300 Victorian-era pets hides inside the city park.