A celebrity from the late Cretaceous period.

When it comes to handsignals (and colonialism) rock always beats scissors.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The most accurate timepiece in the world.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This impressive Boston holy house is the American mecca for Christian scientists.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A single tree's 2,800 aerial roots give the appearance of a complete forest.

Breathtaking and huge 430 year old maps of Italy.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.