Slyly buy a shake in the Parker Meridien lobby.

The oldest surviving synagogue in New York City is now a soaring art space.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

A legendary speakeasy bookstore returns from the brink.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Peek through the gates at this oasis from the city, full of Old English charm.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

A dilapidated dock tells the story of Titanic's missed arrival.

New York City's smallest piece of private property.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Tucked in the back of this amazing antique store is an important piece of medical history.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

Floating man-made island and upscale restaurant.

A hidden subterranean installation offers a view of the sky.

Tiki luxury on Nob Hill.

The restored and active Victorian-era final resting place of San Francisco.

A modern mechanical planetary system, part of a 10,000 year clock.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.