A scientific repository of goiters, boils and other ailments throughout Mexican history.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

Unusual building appears to be haphazardly built from randomly piled bricks.

New York City's smallest piece of private property.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The private clubhouse for the members of the Academy of Magical Arts.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This historic observatory contains the world's oldest refracting lens telescope.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Moscow's imposing monument to the Space Age.

World's oldest and largest space launch facility, once a secret missile testing site.

This iconic Russian space museum sits on a landmark space production facility and houses the Vostok 1, the first manned spacecraft, that was also built here.

Museum celebrating the achievements of the Soviet space program.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.