Isambard Kingdom Brunel, one of the great Victorian engineers, was the driving force behind the short-lived atmospheric railway.

A 14th century castle built on the seat of a mighty giant.

Where the Border Reivers of the Johnstone clan used to hide their stolen cattle.

A twisted steel beam from the wreckage of the World Trade Center is the centerpiece of this memorial for those who died on September 11, 2001.

A concrete mushroom that divided Stockholm residents for nearly a century.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

The encased skull that is widely believed to belong to St. John the Baptist.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

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

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

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

This wild explosion of color on a disused water tower tells the whimsical tale of a curious puffin.

A popular Icelandic children's story comes to life inside this cave.

A replica of the decorated wooden pillars Viking sailors threw overboard when finding new places to establish a settlement.

Along this wire fence, travelers have been leaving a particular memento since 2012.

Three columns of volcanic rock shoot out of the ocean.