Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

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

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

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

A pair of black granite tails dive into a sea of grass in landlocked Vermont.

The final resting place of soldiers' loyal canine companions.

Hear the quietest sound from across the dome.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Home to items never before seen by the public.

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

A self-built castle made by a mysterious man.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Largest lake in Great Britain measured by surface area.

The heads of two giant mythological water horses honor Scotland's horselord past.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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