The "Seinfeld" diner.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Time stands still at this serene burial ground in the center of Budapest.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This magnificent abandoned hotel has long been haunted by its Nazi past.

Reaching the "Church in the Sky" requires scaling the cliff face of a sandstone pinnacle with a 650-foot drop.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

This beautifully deceptive waterfall is something far different from what it appears to be.

Some 20,000 dust-covered unwanted vehicles languish in the desert.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

These termites have an large and deadly abode—impressive by day, dazzling by night.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

A natural gas leak provides a flickering flame beneath a waterfall.