Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A fantastic reconstruction of a 10th-century Viking longhouse.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Elaborate tile work in this railway station tells the story of Portugal.

Ancient catacombs form the foundation for this Rococo orgy of a church.

A hidden three-foot-wide house separates these two regal churches.

The stunning interior of this Gothic church is covered in ornate gold details.

The best place in the world to buy tinned fish.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Strange physical sensations and optical contradictions keep visitors coming back for more.

Talula the swan has been welcoming visitors to Elk Rapids, Michigan, for more than four decades.

Perched atop a brick smokestack, this enormous lug nut symbolizes the local minor league baseball team.

The last remaining tollhouse in Michigan built during the 19th-century plank road craze.

This scenic overlook commemorates the tragic death of a soon-to-be-married lumberjack.

This resort community was known as the "Black Eden of Michigan."

Easily overlooked in favor of the wineries that dot the region, this blast from the past is equally worth the visit.

The plants form a living library and laboratory for researchers and students at Michigan State University.

For more than 50 years, an iconic sign has greeted visiting “fudgies” to the Traverse City area.

"The Most Boring Road in the State."