These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Protecting the dead from opportunistic body snatchers.

The final resting place of soldiers' loyal canine companions.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

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

A sweet symbol marks the place where torturous executions were once carried out.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

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

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

The fountain marks the area where hundreds of accused witches were burned at the stake.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

This mine was once used to defend the coast from attack during World War II.

These engineering masterpieces are a dominant feature of the Belfast skyline.

This massive monument has been telling the time for 150 years—at a slight angle.

A replica memorializes the site where women were punished after the last witchcraft trial in Ireland.

It was once nicknamed "the most bombed hotel in Europe."

These murals stand as reminders to the troubled history of this Northern Ireland city.

Belfast's namesake river still winds below the city center, hidden from sight.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

The only monument to name all of the passengers and crew who died on the RMS Titanic.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.