Plaques

This mysterious sign claims an American astronomer haunts the building—but is it true?

Mysterious markers have been giving the public a lesson in dendrochronology for over a century.

This sign marks the start and end of Matt Green's nearly 10,000-mile quest to walk every block of every street in New York City.

An Asante king spent four years in exile in a house on this very spot.

One of the few remaining water-driven tool shops, originally built in 1911.

The oft-overlooked site of one of the first marine biological research facilities in the world.

A memorial to a 19th-century composer who was known for driving crowds wild.

This marker commemorates a long-lasting historical haunting and demonic possession that led to one of Denmark's worst witch trials.

The location Geoffrey Chaucer and tale-telling pilgrims set off for Canterbury in April 1386.

In 1988, jazz legend Chet Baker fell to his death from a window of this hotel facing Amsterdam Centraal.

This blue plaque commemorates the unexpected origin of one of the world's most beloved deserts.

This bronze marker acknowledges an embarrassing royal blunder.

A small collection of objects of a bygone era hide in plain view.

Presented to the city in 1910 for public use, these brass markers show varying lengths.

Above the door of a house, a plaque claims to commemorate the future living place of the inventor of time travel.

Along the pavement of this neighborhood in Madrid are quotes from famous authors.

In memory of the assassinated, now-canonized Salvadoran archbishop who is the namesake of nearby Romero Place.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.