The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

A six-ton wedding present for the King of the Scots.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

The final resting place of soldiers' loyal canine companions.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

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

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A mouldering Colombian bull ring stands as a reminder of the country's complicated relationship with a brutal sport.

An 18th-century battery complete with original kitchen and garrison.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

The colonial city's social history is reflected in its fanciful door knockers.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

This small Roman arch was transformed into a dwelling by the founder of the Trinitarian Order.