Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

The attic of a four-century-old canal house hides a clandestine church.

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

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A floating cat sanctuary on an Amsterdam canal.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This ancient Egyptian obelisk still bears the wounds of World War I.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

This abandoned lock-up was saved because of its connection to a local football team.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

The red letters in the literary pavement leading to the library form a mysterious code.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

This bronze statue was dedicated to a 1966 Beatles hit.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

This stone once marked the boundaries of Liverpool's medieval markets.

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

Centuries after this 12th-century abbey had fallen to ruin, it became known for the strawberries and cream served in its gardens.

Mysterious chains and iron stakes adorn this strange grave, with no explanation.