"I sightsaw London." Is this correct?

Solution 1:

Surprisingly, some dictionaries such as Collins and Dictionary.com do list sightsee as a verb, with sightsaw as the past form.

On the other hand, I have never heard anybody actually say it. I have heard plenty of people say went sightseeing. A quick trip to Ngram to compare the usage of sightsaw against went sightseeing comes up with plenty of instances of went sightseeing, but sightsaw is 'not found'.

It appears that although some dictionaries are willing to list it as a verb, real live people don't actually use it as a verb.

Solution 2:

It's debatable, and a lot of contributors are going to say no. MW says it is an intransitive verb and lists the past tense as "sightsaw". OALD on the other hand only mentions sightseeing, and that it is a noun. Depends on your dictionary I guess. It is not in common usage now, but language is always evolving, and what is not in usage now may very well be in 50 years.