Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The celebrated eyesore created by starry-eyed sweethearts.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Ancient human remains unearthed around the iconic monument.

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

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

2300-year-old Roman road connecting the empire.

Unconventional site where the tracks of Zurich tramcars intersect.

The bears of Bern have been a city highlight for over 500 years.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.