There aren't too many operational funiculars around, but Pittsburgh has two!

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

Try your hand at old-fashioned coffee growing at this museum devoted to one of the world's most coveted beans.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This 17th-century place of worship still celebrates holidays in the traditional Swedish fashion.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

Exact replica of the ancient monument, but much, much lighter.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

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

The celebrated eyesore created by starry-eyed sweethearts.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Hear the quietest sound from across the dome.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The 570-ton boulder that gave a New Jersey town its name.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.