Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

This decrepit abandoned building is made all the more eerie by its dark history.

The oldest continuously inhabited street in America.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Said to be haunted, this tower was constructed by a sugar importer as a gift to his wife.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

One of the first amphibian migration tunnels in the United States encourages a tradition that has inspired Amherst residents for decades.

Perhaps the most spectacular grotto along the Algarve coastline.

A rock outcropping left by a glacier that made itself useful throughout the centuries.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

Over 50 whirling pools left behind from the glacial age.

This giant Massachusetts sycamore is said to hold the dubious distinction of being the "widest tree East of the Mississippi!"

Only six people can sit inside this delightfully quaint sanctuary.

This seemingly cursed monument is dedicated to one of Canada's great war heroes.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This stunning concert hall has become a symbol of Iceland's national recovery.

An encyclopedic collection of mammal penises.

A field in which God and his son Jesus purportedly appeared to a young farm boy named Joseph Smith.

Golden plates containing what would become the Book of Mormon were believed to be buried on this New York hillside.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.