This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A renovated hotel is bringing new life to a nearly-abandoned mining town in Colorado.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

Mysterious rocks that ring musically when struck.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Destructive children, start your engines.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

A rare view of a preserved Victorian science museum.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

This elaborate towering structure was once famed for its revolutionary height.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This might just be the TARDIS of bookstores.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

A beloved horticultural oasis on the grounds of a wealthy family's former estate.