Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

This sidewalk tribute honors Colorado's great culinary creation.

A downtown park built on top of unclaimed graves.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

Nope, not Washington Irving's house.

The only subway station in the city that still makes use of gap fillers.

The notorious headquarters of a corrupt political machine.

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

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

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

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

This secluded ruin was once a home for exotic plants.

19th century cemetery hidden in Brooklyn's Prospect Park.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This 220-year-old house is a reminder of New York City's Dutch past.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.