The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

The oldest volcanology research center in the world.

The first Italian factory to produce locomotives is now a marvelous museum.

A former Roman town that was once the home of Scipio Africanus.

What started as a display of antique hearses has grown into a museum exploring the history of the funeral industry.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

Near the summit of Mount Washington, a stone monument remembers a life lost to one of the mountain's infamous storms.

Packed with geological formations, an ancient river, and taxidermied seals, this overlooked coastal cave system is worth a spelunk.

How did a literal hole in a wall become one of the top-rated tourist attractions in this English town?

A massive environmental project transformed this former smelter into a beautiful park.

Dedicated to an airmail pilot who never let go of his important payload.

A lush green oasis in the middle of Chicago.

A museum has some wedding cake dating to the Teddy Roosevelt administration, and some bacon from FDR's.

One of the oldest standing structures in Montgomery County, Maryland.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

An ode to the famous Las Vegas signage.

Once the last route taken by condemned prisoners.