These photos were taken at, around Central Park which can be found centrally from 59th to 110th Streets and from 5th Avenue to Central Park West in Manhattan.

This building can be seen from various locales within Central Park. But one of the only spots from which you can see it at this angle is Belvedere Castle.
The above photo was accomplished using PhotoMatix and lots of post-processing. Mind you only one NEF (RAW) images was used for it.

The above image features turtle pond with the 'Great Lawn' just beyond it.
HDR was only barely applied to bring a bit of light where through a single exposure light didn't exist. Again 3 handheld shots were taken to arrive at this point.

Here are some branches yours truly stumbled upon. I can't say I recall where exactly I'd found them and well, it doesn't really matter since they're simply a set of ordinary branches. All I CAN say is that for some reason they'd caught my eye.
This image is HDR taken to the extreme using PhotoMatix.
3 handheld photos were taken for this using bracketing for varying exposures.