This artificial cave looks like something out of a fairytale.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The celebrated eyesore created by starry-eyed sweethearts.

A small but immensely extravagant palace built by the "Night King."

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

A motel dedicated to Southwestern nostalgia.

This black shoreline is made up of exploded lava particles.

One of the few surviving "Wigwam"-themed motels.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

An experimental, automotive replica of Stonehenge.

The patron saint of spinsters grasps a container of dried blood.

Ancient pueblos built into the base of a natural canyon wall.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Museum dedicated to the terror regimes of Hungary.

Once the home of a hermetic monk, this cave now houses a small church.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.