This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

This waterfront museum in Maine is dedicated to the history of the smoked-herring trade.

A charming museum of natural history featuring dioramas and exhibits made entirely by college students.

Its unique collection details the history of the state's svelte railroads.

Mexico's second-tallest monument, now half-hidden in a private residential complex.

Mexico's National Sound Library houses music, recordings, and voices from the nation's rich past.

The unique collection of gifts includes braids of human hair, a spoon, and a Virgin made of bread.

Malcolm X's house during his most formative years faces an uncertain future.

The palatial McDonald's that inspired Wesley Willis.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

These pretty kitties killed and ate as many as 135 railway workers.

After the parade, students throw their beads on the tree hoping for good luck on exams.

An abandoned underground bunker not far from downtown New Orleans.

A house of courtship where the Jazz Age's most storied lovers got their start.

The second oldest continuously operating bar in Louisiana.

An old-timey wax exhibition campily depicting New Orleans legends and scandals.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

Tour the sci-fi-esque reality of governmental disease management.

The subtle science of a master molecular gastronomist.

An antiquated German apothecary on Chicago's North Side.