This giant wooden treehouse within a sprawling garden has its own eatery.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This 16th-century house tells the city's history through old artifacts and quirky tales.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

At this historic pub, you can sit back, sip, and watch a whole century go by.

An overlooked memorial honoring the local Washington residents who died in World War I.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This grand gothic brewery has been pumping out suds for over a hundred years.

Home to items never before seen by the public.

Drink among marionettes at this pub inside a historic puppet theater.

Lavish royal estate punctuated with heated greenhouses.

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.

A once-magnificent collegiate church is falling into ruin.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Medical history with an amazing, if frighting, collection of wax diseases on display.

Most prolific publishing house in the 1600s open to the public.

This small corner bar is home to a rare 1930s dance organ that still plays tunes for one Euro.