This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Soaring over the Niagara Whirlpool since 1916.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

One of seven Jewish catacombs in Rome and one of only two open to the public.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The underground sanctuary of a mysterious ancient cult.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

One of the most controversial statues in Romania is an emperor with no clothes.

Romania's triumphal arch looks out over Bucharest.

A medieval church built up to defend its village.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.