A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

During the holidays, a vintage subway train whisks New Yorkers back in time.

New York City's smallest piece of private property.

The first piece of public art dedicated to LGBT rights.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

This technicolor classic diner is known for its nine-pound banana splits and retro flair.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Finally, you don't have to be a pious Swedish seaman to relax like one.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Turntable anonymously received orphans, alms, and groceries.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.