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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Paris' linguistic guide to the international language of, yes, love.

The oldest stone house in Paris was built by its most famous alchemist.

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

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

Filled with history, this cemetery is maintained each summer by a few hungry goats.

On the Hudson resides one of the largest clocks in the world.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

An allegedly cursed tree represents a town's reckoning with a racist past.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Local lore claims this park is named after a young woman who jumped off a cliff.

The boulder on which Alexander Hamilton laid his head after a deadly duel can still be visited on the New Jersey coast.

Series of storm drains connected to a dark urban legend.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The Andean town where every single building is decorated with a brightly colored frieze.