Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

A historic arboretum and non-conformist, non-denominational park cemetery.

A cluttered and astounding collection of antiquities and curiosities.

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

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

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

Where royalty waits in the height of luxury.

Amsterdam's former hotspot for public executions and dissections.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Inside a London bookstore, a fireplace that once belonged to the illustrator responsible for a famous set of tarot cards.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.