The sign at the garden gate reads: "These Plants Can Kill."

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The only remaining U-boat that is still floating never actually saw any action in World War II.

Iceland's tribute to its thankless civil servants.

This stunning concert hall has become a symbol of Iceland's national recovery.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The site of one of the largest prison escapes of World War II.

A public urinal so pretty, it was declared a national monument.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This watchtower once presided over the Berlin Wall.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

Modern art commemorates one of the first military actions of World War II.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.