This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

A close look reveals that the Scottish monument is just slightly off-kilter.

A scattered trail of street art adds a pop of color to the city's stark structures.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

The Guinness Record holder for largest hedge in the world is a verdant Scottish bulwark.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

This Scottish burial tomb once held hundreds of ancient eagle bones.

Enter the world under the hill at this ancient UK burial chamber.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

Legend says this cave housed a 16th-century cannibal and his family of 48.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

The remains of a sunken military ship wreck visible through clear water.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

An ethereal glowing blue ocean cave in Croatia.

A naturally beautiful, seemingly bottomless deep blue spring.