The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Narrowest house in Boston.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This replica of the Greek structure is in the heart of Nashville.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

This magnificent Cincinnati graveyard is also a popular public park.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

The humble horn finally finds a place in the sun.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

A monument to the love people have for their pets.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

The only visible piece of San Francisco's most famous shipwreck.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The remains of a ruined mansion memorialize the 1906 earthquake.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

This 'Murder House' grand mansion has starred in everything from Bones to Buffy.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

30 years worth of pressed-tin, bakalite, and characters both loved and forgotten.