The gallery object has the following attributes:

gallery.url

Returns the relative URL of the gallery.

gallery.name

Returns the title/name of the gallery.

gallery.photo_url

Returns the first photo of the gallery.

gallery.photos

Returns the gallery.photos array.

photos

{% for photo in gallery.photos %}
    {{ photo.name }}
    {{ photo.url }}
    {{ photo.target_url }}
{% endfor %}

returns...

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photo.name

Returns the name of the gallery photo.

photo.url

Returns the URL of the gallery photo image file.

photo.target_url

Returns the relative target URL of the gallery photo.

Videos

video.title

Returns the title of the video.

video.embed_code

Returns the embedding code of the video.