One of Monterrey's oldest buildings is perched atop a hill boasting impressive views of the city.

A mysterious, ancient collection of pre-Hispanic petroglyphs hidden deep in the Mexican desert.

Inside this mountain lies several kilometers of breathtaking caves.

A giant Jesus statue watches over the city of Saltillo from the top of a mountain where it has been commandeered by vandals.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

Waterway populated with abandoned projects, including a submarine.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

This was one of the first (and last) university-built and operated nuclear reactors.

Discover the taste of mold.

A sculptural commentary on capitalism pokes up from the East River.

Finally, you don't have to be a pious Swedish seaman to relax like one.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

Historical figures from New York City's Catholic community reside in Midtown.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

There must be a pun in this haystack somewhere...

A curious friendship between two inanimate ladies.

Commemorating the spot where the famous scientist fed his pigeons.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

A whimsical, but often overlooked clock in Park Avenue.

The former hotel where Tesla invented the radio.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.