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

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Where the lovelorn find a home for their sentimental keepsakes.

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

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Go inside to really appreciate this 500-year-old technological masterpiece.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

An architect's childhood fantasy treehouse made real.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

There are eight natural springs around town, each with a slightly different taste.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

Population: 1.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

This historic Victorian hotel has a scandalous history of affairs and murder.

A museum within a museum, devoted to history's most questionable medical devices.