Niagara Falls
The Niagara Falls were a location in North America. A city was located nearby. (TV: Nikola Tesla's Night of Terror)
Nikola Tesla considered the Niagara Falls to be the best demonstration of the sheer power of nature. When he first saw them he was inspired to built his Niagara Generator, which was completed by 1903. Tesla started his presentation of the generator in front of the Niagara Falls. (TV: Nikola Tesla's Night of Terror)
The Tenth Doctor once recounted a tale of him going over them with a Chelonian. (COMIC: Silver Scream)
References
After the TARDIS fell off a cliff in Italy in 64, Barbara Wright remarked that she felt like she'd been over Niagara Falls in a barrel. (PROSE: Romans Cutaway)
Behind the scenes
In an InnerSpace interview for series 10, Peter Capaldi commented that he hopes Doctor Who films at Niagara Falls. Capaldi felt it's a location he's not seen on film or television in a while, when it used to be quite popular.
