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

One part local history, 99 parts gruesome haunted house.

Gothic tower where Lord Alfred Tennyson wrote the poem "The Sleeping Beauty."

A domino effect created with Britain’s iconic telephone boxes.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

The world's first consecrated windmill.

This memorial is dedicated to the legendary suffragette, who stepped in front of the king's horse during the Epsom Derby.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.

Hiding in plane sight.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

An ode to one of the first concerts broadcast via satellite.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

This public pool is one of the last remaining lidos of the countless built in the 1930's as public works projects in the United Kingdom.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

The world's most elegant power lines.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

An enormous alien invades Woking, England, as an homage to the H.G. Wells classic 'The War of the Worlds.'

The world's first purpose-built motor racetrack was destroyed by the outbreak of two world wars.

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