One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A little sculpture with a large wardrobe.

Amsterdam's former hotspot for public executions and dissections.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

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.

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

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

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

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

An enormous, inside-out glass globe built in 1935.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Elevated freight railway turned wildly successful urban park.

One part local history, 99 parts gruesome haunted house.

Eighty million natural history specimens call this gargantuan museum home.

This Parisian gem is one of the most incredible ethnographic museums in the world.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.